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- Discuss the justification for this statement: “Although one does not normally regard NH+4 as an acid, it is actually only slightly weaker as an acid than hydrocyanic acid, HCN, in aqueous solution.”Calculate the pH of Ba(OH)2 solution whose 250 cm3 of a 0.01moldm-3 solution is diluted to 500 cm3 with deonised water.Assuming the change of pH with respect to temperature is linear, estimate the pH of distilled water at 75 oC.
- In theory the pH of distilled water will be 7 or slightly less…why?At 250°C, the equilibrium constant for the dissociation of water is 10–11.16. At this temperature, what is the pH of a neutral solution?Consider an aqueous solution of pyridine, C5NH5(aq), with F = 5.0 mM, at 1 bar and at 298 K. Pyridine is a weak Brønsted-Lowry base. Structure of pyridine, Write all the relevant chemical reactions among the species
- Acidic water can be treated with basic substances to increase the pH, although such a procedure is usually only a temporary cure. Calculate the minimum mass of lime, CaO, needed to adjust the pH of a small lake 1V = 4 * 109 L2 from 5.0 to 6.5. Why might more lime be needed?The ionization constant, Ka, for dichloroacetic acid, HC2HO2Cl2 , is 5.0 × 10‑2. What is the pH of a 0.15 molar solution of this acid?What is the Kw of pure water at 50.0 degrees Celsius, if the pH is 6.630?
- The pH value of the 5L aqueous solution prepared with 6.4 grams of a precious strong acid is 2. So what is the molar mass of the acid?The pH of an aqueous solution of pyridine (C5H5N) is 10.0 at room temperature. What is the initial molar concentration of C5H5N, if its base ionization constant is: Kb = 1.7×10–9?TRIS (also known during medical use as THAM) is an organic compound used extensively in biochemistryand molecular biology as a component of buffer solutions, especially for solutions of nucleic acids. At 37oC,-7body temperature, its Kb value is 5.13 x 10 . What is the approximate ratio of acid to base at pH 7.4, the pH ofblood?